The biosorption of chromium (VI) ions from aqueous solutions by two adsorbents viz. mango and neem sawdust was studied under a batch mode. An initial pH of 2.0 was most favorable for chromium (VI) removal by both the adsorbents. The results obtained for the final concentration of chromium (VI) and chromium (III) at a pH range of 2-8 indicated that a combined effect of biosorption and reduction was involved in the chromium (VI) removal specially when the pH value is lower than 3. The maximum loading capacity was calculated from adsorption isotherms by applying the Langmuir model and found to be higher for neem sawdust (58.82 mg/g). Evaluation of experimental data in terms of biosorption kinetics showed that the biosorption of chromium (VI) by neem sawdust followed pseudo second-order kinetics. Therefore, the rate limiting step may be chemical sorption or chemisorption. The efficiency of this process was examined in using tannery wastewater contaminated with chromium (VI) ions in column mode. {\textcopyright} IRSEN, CEERS, IAU.

Nilanjana Mitra

Department of Bio-Medical Sciences

School of Bio Sciences and Technology

Vellore Campus

Vinodhini V

Fulltext

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

&nbsp;

&nbsp;

VIT University

International Journal of Environmental Science & Technology

Heavy-metal contamination is one of the world's major environmental problems, posing significant risks to agro-ecosystems. Conventional technologies employed for heavy-metal remediation have often been expensive and disruptive. This book provides comprehensive, state-of-the-art coverage of the natural, sustainable alternatives that use a wide range of biological materials in the removal/detoxification of heavy metals, consequently leading to the improvement of crops in these soils. Novel, environmentally friendly and inexpensive solutions are presented based on a sound understanding of metal contamination and the roles of plants and microbes in the management of these toxic soils. Written by worldwide experts, the book provides not only the necessary scientific background but also addresses the challenging questions that require special attention in order to better understand metal toxicity in soils and its management through bioremediation.

Environmental Pollution Biomanagement of Metal-Contaminated Soils

Chromium Pollution and Bioremediation: An Overview

The removal of Cr (VI) from tannery wastewater by neem sawdust was investigated in a fixed bed column. The experiments were conducted to study the effect of important parameters such as bed depth (5-15 cm) and flow rate (5-15 ml min-1). The bed depth service time model (BDST) fit well with the experimental data. The adsorption capacity estimated from the BDST model was 33,009.9 mg g-1. The column was regenerated by eluting chromium (VI) using 2 N NaOH after adsorption studies. The desorption of Cr (VI) failed to reach 100{\%} in each cycle because some amount of adsorbed Cr (VI) got reduced to Cr (III) in the biosorbent surface and released into the aqueous phase. The effect of co-ions on adsorption of Cr (VI) was studied in column mode, where the breakthrough and the exhaustion time of the column decreased in the presence of co-ions. In the three cycles of biosorption, about 3.75 L of tannery effluent were treated to reach the chromium (VI) standard (0.1 mg L-1) established by the Central Pollution Control Board (CPCB). Neem sawdust proved to be the potential biosorbent for the removal of Cr (VI) from tannery effluents. {\textcopyright} 2010 Elsevier B.V.

Desalination

Packed bed column studies on Cr (VI) removal from tannery wastewater by neem sawdust

Relevant approach to assess the performance of sawdust as adsorbent of chromium (VI) ions from aqueous solutions

Current Problems in Cancer

Author BioSketches

Sorption isotherms and kinetics of chromium uptake from wastewater using natural sorbent material

A novel adsorbent for heavy metal remediation in aqueous environments

Air Pollution Control Equipment Calculations

Venturi Scrubbers

Journal	Data powered by TypesetInternational Journal of Environmental Science & Technology
Publisher	Data powered by TypesetSpringer Science and Business Media LLC
ISSN	1735-1472
Open Access	Yes